Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Brake System Control Module 2
DESCRIPTION
Models that are equipped with the Hands Free Active Driving Assist System incorporate the Brake System Control Module 2 (BSCM2) (1), which is located in the right rear corner of the engine compartment, secured to the BSCM2 Hydraulic Control Unit (HCU) (2). The BSCM2 is available separately for service from the BSCM2 HCU.
The Brake System Control Module (BSCM) and BSCM2 jointly control all operation of the braking system.
OPERATION
The BSCM2 controls the valve body, pump motor, low pressure accumulators, inlet valves, outlet valves and noise attenuators in the BSCM2 HCU. Accumulators in the valve body store extra fluid released from the calipers during an ABS event operation. The motor is controlled by the BSCM2. The valves modulate brake pressure during antilock braking and are controlled by the BSCM2. During antilock braking, the solenoid valves are opened and closed as needed. They are cycled rapidly and continuously to modulate pressure and control wheel slip and deceleration. Brake Traction Control and Electronic Stability Program modulate pressure on each wheel individually without any driver brake input. The valves are all contained in the valve body portion of the BSCM2 HCU.
The front Wheel Speed Sensor signals are sent to the BSCM2 to be broadcast on the Controller Area Network - Flex Data (CAN-FD) data bus.
The BSCM2 is serviced separately from the BSCM2 HCU.
The BSCM2 is powered by a 50 amp fuse and a 30 amp fuse in the Power Distribution Center (PDC). The BSCM2 receives an ignition RUN/START feed from a 10 amp fuse in the PDC.
For more information on how the BSCM2 operates in the various braking systems. Refer to BRAKING SYSTEMS, DESCRIPTION AND OPERATION .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.